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Intel D845GVSR motherboard; eMachine T2824
Topic Started: Oct 1 2006, 08:10 PM (3,666 Views)
azpicturethis
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A family friend has an eMachine T2824 with the Intel D845GVSR motherboard. He brought it over for me to take a look at. It does not power up at all (no power supply fan, motherboard light ... nothing).
I removed the power supply (which rattles like there might be a screw/part loose inside) and replaced it with a known good power supply (out of a brand new case that I have). All that would happen is that the motherboard green light comes on, but nothing else powers up (not the power supply fan or anything else). So, I thought that maybe the power switch on the case might be defective. I located the pins for the power and tried jumping them ... nothing happens!
Then I tried the same procedure with a brand new (still in shrink wrap) Antec 480w power supply and got the exact same results ... green light on motherboard, but no powering up of the power supply or anything else.
Am I to assume that the motherboard died when the power supply died? Or am I missing something else to diagnose?
Any help or thoughts would be appreciated ... Thanks!
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dwev
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Did you try shorting the Green wire to the Black on the psu (20/24 pin connector) itself to see if that turns on it's (psu) fan?
Pinout can be found here for 20pin:
http://pinouts.ru/Power/atxpower_pinout.shtml
24pin:
http://pinouts.ru/Power/atx_v2_pinout.shtml
If the psu fan don't run by shorting (jump starting) it sounds like bad psu.

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waycool1969
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try taking out the backup battrey and put it in about 5 minutes later and try to turn the pc back on, hope this helps you.
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csrjohn
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az

If you've tried the above suggestions and determined the PSU works & the CMOS has been cleared - There are only 2 things left that I can suggest.

Provided you're working with a bare mobo and jumpering the contacts to eliminate Power Switch, all that's left is the RAM & CPU.

Try swapping RAM for known good, or if not available, at least try with 1 stick at a time, swapping slots. You could also test RAM in another PC.

Although it's more likely a bad mobo, as the Imperials are known for this failure, it could be a bad CPU (the mobo won't fire up without a working CPU)

2 ways to check this - try the CPU in another Socket 478 PC and/or try a known good CPU from another Socket 478 PC in the suspect mobo.

Note If you do any CPU swapping, preferably use a PC with an Imperial board, or at least one that supports Northwood, Willamette CPU's

More than likely, you're right though, he had a meltdown from the bad PSU & you have a dead mobo and POSSIBLY a bad CPU (although rare)

To help determine if a meltdown occured, test the CPU fan from a 12V source (a jumpered PSU or even a 9V battery!)

If CPU fan doesn't work, you had a major meltdown and may well need both mobo & CPU

If CPU fan is working, you have a better chance of the CPU surviving the meltdown!

Good Luck :D
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lubner10
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csrjohn
Oct 3 2006, 11:06 AM
To help determine if a meltdown occured, test the CPU fan from a 12V source (a jumpered PSU or even a 9V battery!)

If CPU fan doesn't work, you had a major meltdown and may well need both mobo & CPU

If CPU fan is working, you have a better chance of the CPU surviving the meltdown!

:rolleyes: :blink: :unsure: :huh: :( :o :mellow: :wacko:
Silly me.....I thought you needed to check each component itself before discarding!
But there again I don't "jumpered" nor "jumpering" anything either. :D :P :lol:
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csrjohn
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Excatly what I was saying. To test the CPU fan before discarding anything.

For someone who doesn't have a 12V souce, jumpering the connections on a PSU so it will fire up (as dwev provided links for) provides a good 12V source for testing components such as fans B)

Molex adapters with 3 pin fan connectors can be had for a few $$ making for solid connections for testing.

I use a PSU tester, which as soon as it's plugged into the 20 pin connector fires up the PSU right on the bench :D

Was I being too obvious? azpicturethis asked if he was missing anything & I gave a few unlikely, but possible causes besides a PSU failure taking out the mobo. (as he was thinking)

I merely suggested he check the remaining components - What was wrong with that? CaptainJack
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lubner10
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I'm sure azpicturethis knows exactly what/why I suggested.
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csrjohn
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You didn't suggest anything
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lubner10
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csrjohn
Oct 3 2006, 11:56 PM
You didn't suggest anything

csrjohn, Do not disrupt this post on azpicturethis or you will not be here much longer!
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csrjohn
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Don't worry, I'm leaving before you have a chance to throw me off.

You've been picking apart my posts since I joined.

I'm unsubscibing now - Thanks!
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lubner10
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Sorry azpicturethis for the interruption. Hopefully this won't happen again. Please let us all know how things work out for you.
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azpicturethis
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OK.
Here is what I tried from the above suggestions:

1. Jumpered the green and black wires on the power supplies. Nothing happens with the "original" PSU (I belive it is safe to say that it is DEAD). With the other 2 known good power supplies, when jumpered (shorted), the power supply fans come on and run normally.
When either of the "known good" PSUs are installed(connected) to the motherboard, only the motherboard green light comes on, nothing else.

2. I took the CMOS battery out of the motherboard and left it out for about 36 hours (figured that should should do it). Still no change in anything.

3. Both sticks of RAM (512mb of PC2700) were temporarily placed in another machine and they both (together and singly) worked just fine.

4. I do not have another 478 board to test the CPU in.

So ... is my conclusion that the power supply is dead, the motherboard is dead, and the CPU might be dead? This won't make the family friend happy, but at least he'll know what our best guess is. If he wants further testing, he can take it to Best Buy or Fry's and let them give him the same news but charge him $$$.
Cooler Master 932 HAF AMD edition Computer Case
AMD Phenom II X6 1090T
MSI 870A Fuzion mobo
Patriot PC12800 DDR3 1600MHz Dual Channel Memory 8GB
1- Seagate 1Tb HDD
EVGA GTS 450 1Gb
DVD±RW w/Lightscribe
Windows 7 Professional 64bit
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lubner10
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I agree. There's something with that board. Since you have a Fry's close you could go there and see if they have a board that might be a good candidate for a replacement to test with. The nice thing about Fry's is after trying it and if it don't work out for you or you just don't like it they give you 14 days to return any computer part and receive a full refund (cash) with no questions asked!!! Good luck.
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g3b
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Hello guys! I know this thread is at least 3yrs. old but I have a friend with the same problem on a T-2824 emachine...switched the psu out & got the green light on the MB. Then took to Frys & the they said the MB was cratered.
I went on the web and found the following 478 micro board on the Egg: BIOSTAR P4M900M4 478 VIA P4M900 Micro ATX Intel Motherboard, pentium 4 3.0 chip for 51.99 (open box) & will get a heatsink/fan for it. Still have the windows activation sticker on the case. Is there any way to check if the harddrive is still good? Any way if it is I will attempt a system restore/repair from it.

If anyone has any thoughts on the feasibility of the project (125.00 greenbacks) let me know if I am overlooking something. (I have a spare Sparkle 350 psu that I will use on it). Thanks for your help.
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TJSEVEN
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You can attach the HD as a slave to another system if she spins up and you can see the files it's probably okay.
If you want to save another $25 bucks on that processor try here:
http://www.starmicro.net/detail.aspx?ID=509
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